"She advises readers to “eat butter; drink milk whole, and feed it to the whole family...." Isn't lactase persistence in modern humans a consequence of pastora

"She advises readers to “eat butter; drink milk whole, and feed it to the whole family...." Isn't lactase persistence in modern humans a consequence of pastoralism of the neolithic era? In Europeans, the genetic mutation for it is estimated to be only 7,500 years old. ... Oh, I see from various web sites that this is a contentious point among paleo practitioners.